Hollow-walled boxes



1955 M. 1. WILLIAMSON HQLLQW-WALLED BOXES 6 Sheets-Sheet 1 Filed April 13, 1953 IN V EN TOR. Marshall 1. Williamson Oct. 2, 1956 M. l. WILLIAMSON HOLLOW-WALLED BOXES 6 Sheets-Sheet 2 Filed April 13, 1955 x INVENTOR.

M a rsh all I. Wz'llz'amsarz Oct. 2, 1956 M. l. WILLIAMSON 2,765,113

I HOLLOW-WALLED BOXES Filed April 13, 1953 6 Sheets-Sheet 3 IN V EN TOR. Marshall I. Williamson A rramvr Oct. 2, 1956 M. 1. WILLIAMSON HOLLDW-WALLED BOXES 6 Sheets-Sheet 4 Filed April 13, 1953 INVENTOR. Marshall Williamson Oct. 2, 1956 1. WILLIAMSON HOLLOW-WALLED BOXES e Shets-Sheet 5 Filed April 13, 1953 IN V EN TOR. Marshall 1. Williamson A TTORNE') Oct. 2, 1956 M. WILLIAMSON HOLLOW-WALLED BOXES 6 Sheets-Sheet 6 Filed April l3, 1953 IN V EN TOR. Marshall [I Williamson I A TTOR/VEY United States Fatent C HOLLOW-WALLED BOXES Marshall L Williamson, New Haven, Conn. Application April 13, 1953, Serial No. 348,359

6 Claims. (Cl. 229-34) This invention provides a novel and improved construction of boxes, cartons, trays, or other receptacles made from paperboard, corrugated board or other foldable sheet material, hereinafter collectively referred to, for convenience, as boxes or folding boxes.

This invention has particular reference to folding boxes having hollow walls of substantially triangular crosssection. Such boxes are sometimes referred to as beveledge boxes or bevel-edge trays.

Hollow walled boxes of the aforementioned type are particularly well suited for the purpose of visually displaying merchandise in an attractive and eye-catching manner in addition to the more mechanical function of protecting the merchandise during shipment.

The dimensions of bevel edge boxes vary within rather wide limits, depending on the particular use of the box. Relatively small boxes are used for perfume, jewelry and candy, large boxes are used for the packaging of tools, silverware or even blankets. Not only do box sizes vary, but there is also considerable variation in the slope of the beveled walls and the height of the walls. This leads to problems in the manufacture and assembly of the boxes.

Since bevel edge boxes take up a relatively large amount of space, when set-up, it is desirable to construct the boxes in such a way that they may be stored in flat collapsed condition, from which they are later set up into hollow box form. It is essential, in this connection, to construct the boxes in such a manner that the setting-up operation is simple and quick, and further in such a way that the set up box has great rigidity.

To this end it has been proposed to perform all securing operations, such as gluing or stapling, at the box manufacturers plant on the flat or collapsed blank, so that the setting up operations at the customers plant are limited to the folding of walls or tucking of flaps.

All previous box constructions of the pre-glued type, as far as I am aware, were limited to walls of a certain predetermined slope, which could not be altered at will, since at other angles the pre-glued box blanks were not collapsible into fiat condition.

The present invention provides a box construction which permits selection of any angle for the sloping walls, yet permits collapsing of the completely pre-glued blank into fiat space-saving form. The invention further provides numerous constructional features resulting in great strength and rigidity of the set up box, simplified assem bly, and other advantages.

These and various other objects, features and advantages of the invention will appear more fully from the detailed description which follows, accompanied by drawings showing, for the purpose of illustration, a representative embodiment of the invention. The invention also consists in certain new and original features of construction and combination of elements hereinafter set forth and claimed.

Although the characteristic features of this invention which are believed to be novel will be particularly pointed Fatented Oct. 2, 1956 out in the claims appended hereto, the invention itself, its objects and advantages, and the manner in which it may be carried out, may be better understood by referring to the following description taken in connection with the accompanying drawings in which:

Fig. 1 is a plan view of a representative flat cut and scored box blank incorporating the present invention;

Fig. 2 shows the blank of Fig. 1 after a first folding and gluing operation resulting in the formation of a tubular blank;

Fig. 3 is a perspective view of a portion of the blank of Fig. 2 in the process of expansion into hollow box form;

Figs. 4 and 5 are perspective views, illustrating further advanced stages of the assembly;

Fig. 6 is a perspective view of the completed box;

Fig. 7 is a sectional view of a portion of the box of Fig. 6, the section being taken in plane 7--7 of Fig. 6;

Fig. 8 is a plan view of a modified fiat cut and scored box blank embodying the invention;

Fig. 9 is a sectional view illustrating the construction of the side walls of a box made from the blank of Fig. 8;

Fig. 10 is a sectional view, similar to Fig. 9, of a modification of the box shown in Fig. 9, the modification involving the addition of an integral inner main panel;

Fig. 11 is a sectional view, similar to Figs. 9 and 10, of a box comprising a large separate inner main panel;

Fig. 12 is a sectional view, similar to Fig. 11, of a differently constructed box comprising a small separate inner main panel;

Fig. 13 is a perspective view, partly in section, of details of the construction of the box of Fig. 12;

Fig. 14 is a plan view of a modified flat cut and scored box blank embodying the invention; and

Fig. 15 is a perspective view of a box formed from the blank of Fig. 14.

In the following description and in the claims, various details will be identified by specific names for convenience. These names, however, are intended to be as generic in their application as the art will permit. Corresponding reference characters refer to corresponding parts in the several figures of the drawings. 7

In the drawings accompanying, and forming part of, this specification, a certain specific disclosure of the inven tion is made for the purpose of explanation of broader aspects of the invention, but it is understood that details may be modified in various respects without departure from the principles of the invention and that the invention may be applied to other structures than the one shown.

Referring to the drawings, the blank A in Fig. 1 may be cut and scored in multiple from rolls or sheets of paperboard, cardboard, or other flexible sheet material. Only one side of the board need be imprinted or otherwise decoratively finished, since only one side of the blank is exposed to view in the finished box. In Fig. 1 the blank is shown in the position in which the unfinished surface faces the observer.

The blank is subdivided into panels and flaps by a plurality of score lines. A main bottom panel 11 is bordered by outer side fold lines 12 and 13 and outer end fold lines 14 and 15. These fold lines intersect at the corners 16, 17, 18 and 19 of the main panel which, as will later be seen, become the outer corners of the box.

Outer side wall panels 20 and 21 are articulated to the main bottom panel 11 along the outer side fold lines 12 and 13, respectively. Inner side wall panels 22 and 23 are articulated to the outer side wall panels along side ridge fold lines 24 and 25. A panel 26 is articulated to the inner side wall panel 23 along inner side fold line 27, and a glue lap 28 is articulated to the upper bottom panel 26 along a return fold line 29. This glue lap 28 may r 3 also be consideredan intermediate bottom panel, as will laterappear'fronr Fig.

An upper bottom panel is articulated to the inner side wall panel.22 along an inner side fold line 31,.and

an intermediate bottom panel or liner 32; is' articulated:

to the upper bottom panel3i) along a returnifold'line 33.

The liner 32may be. cut outat'34' to accommodate the glue lap 28in the gluediblank as will later. be seen.

The liner panel 32 has slits 3'5" and 36" therethrough. These slits are preferably in line with the inner endwall panels of. the finished box aswilllater become apparent. The slits 35' and 36 permit flaps on the end wall' structure to be inserte'd'as will later be explained in greater detail; To facilitate such insertion of flaps, the liner. panellis fhrther provided with cuts 37arrd 38 and. fold lines. 39, 40, 41 and'42; Triangular panelporti'ons43, 44', and 46 are thusformed.

Guterendwall panels 47 and' 'are.articulated'to the main panel. 11 along the outer'endfoldlin'es l'dan'd'. 15; respectively: Inner end wall panels 49 and 50 are articulated to. the outer end wall panels along end ridgerfold.

lines 51v and 52, respectively. Bottomflaps 53 211x154 are articulated to the inner end wall panels 49 and 59 along inner end fold lines 55 and 56, respectively.

Lock tabs 57, 58, 59 and 69 are articulated: to the bottom fi'aps53 and54 along fold" lines 61, 62; 63' and 64" about: which the lock tabs are foldable' back upon' the respective bottom flaps:

Side flaps 65' and 66* are articulated. tothe outer end wall panel 47'" along oblique flap fold lines 67' and 68 extending atanangle with respect'to theouter end fold line 14'; A further pair ofside flaps wand 76 is articulated to' the outer end wall panel 48 along oblique foldlines 71 and 72, respectively.

The provision of the'side flapsS, 66,69and 7th is However, as will later" become apparent, the

optional.

sideflaps, besides performinga: structural function, result in.neater' appearance, since no cut edges are exposed at the corners of the box, if the aforementioned side flaps are employed.

The corner structureof the blank includes three'panel portions bordered by a common point of intersection onthe side ridge fold lines. In theillustratedform of blank substantially triangular" panel portions. 73 and 74' are articulated to the inner side wall panel 22 along corner'foldlines 75 and 7 6, respectively. These foldlinesintersect the side ridge fold line 24 at 77 and 78; A further pair' of substantially triangularpanel p0rtions79= and 801s; articulated panel '20 along' corner'fold lines 81 and'82; respectively. It'will' be noted that these corner to the outer side wall fold linesSl-and 82 are also aimed atthe points of inter section 77 and 78, respectively; The panel'portions79 andare further bordered by the extended ridge fold line24. Furfherpanel portions 83 and 84 are-articulated to the-panel portions 79 and 89 along thefoldline 24 andareborderedby corner fold lines 85 and 86' towards the panel portions' 73'and'74, respectively. The corner fold lines 85 and 86 are also aimed at the points-77 and 78; respectively.

Securing flaps 87 and 88 arearticulated to the panel portions' 79, 83- and 80, 84 along 'flap fold lines 89 and 90, respectively; These securingflaps'perform their function in a" variety of ways, as will later be seen. They may be'caused'toabut one or more fold lines of the blankwiththeir outer'edges, such'abutment edges being 91 and 92 on the securingflap' 87, and edges 93 and.94i on the securing flap 88.

In: a similar; mannergsubstantially triangular. panel portions95. and 96 are articulated tothe-innersside wall panel"23:.along'corner fold lines 97 and. 98-,- respectively, Thesesfoldlines intersect the side ridge. fold line 25 at 99-:andl00, respectively. A further pair of substantially triangularpanel portionsllll. and; 102 is articulated to theeouter siderwall: panel 21 alongcornerfold lines..103

four' corner fold li'nesaimed at" and 104, respectively. It will be noted that these corner fold lines" 193' and 104 are also aimed at the points of intersection 99 and 1%, respectively. The panel portions 191 and 1' 2 are further bordered by the extended ridge fold line 25. Further panel portions 105 and 106 are articulated to the panel portions Hi1 and 102 along the fold lines 25 and are bordered by corner fold lines Hi7 and 198 towards the panel portions 95 and 96, respectively. The corner fold lines 167 and 1193 are also aimed at the points 99 and 1%, respectively.

Securing flaps. 1&9 and 116 are articulatedto the panel portions 1&1 and 1&2 along flap fold lines 111 and 112, respectively. These securing flaps 109 and 110 have abutment edges 113, 1-14, midi-115,116, respectively.

The side flaps 65, 66, 69 and 70 have cut bordering edges 117, 3.1%, 119, 129, 121, 122, 123 and 124, respectively, which are so disposed that the cut edges abut certain fold lines of other panels in the assembled box. as will later be seen.

The assembly ofthe blank A shown inFig. 1 into box form may proceed as follows:

Adhesive a is first applied to the glue lap 28 and'to the marginal surfaces of the liner panel 32'. The blank is then folded along the side ridge fold lines 24' and 25 to bring the liner panel 32 over the main panel 11 and to bring the glue lap 28 over the main panel 11 into the recess 34. The result is a flat collapsed'tubular blank A' in which the liner panel 32' and the gluelap 25 are adhesively secured to the main panel 11'. The tubular blank 11' is shown in Fig. 2.

The blank A may be shipped and stored in fi'at' collapsed condition and requires a minimum of space for' shipping and storing. It may easily be setup into hollow box form by a simple expanding and folding operation which will now be described;

The fiat collapsed blank A is expanded by pressure exerted against the edges 24 and 25'. This causes the side wall structures to expand. and move towards each other until the upper bottom panels 26 and' 30' lie in surface-to-surface contact with the liner main panel'32" thus forming a. return fold RF. The resulting structure" is shown in Fig. 3. The inner and'theouter'side'wall panels assume the slope they have in the finished box;

It is quite apparent that the depth of the return fold;

measured between the fold lines33 and 31 or between",

27 and 29 may vary considerably. This variation per mits various slope angles to be: selected for the outerside" panel, the width of the inner" side wall panel and the slope of the latter (most commonly, although-not necessarily, 90 degrees) fixes the slope of the outer side wall" panel with regard to themain'panel. According to the. previously'stated relationshipef widths and spacing,- itistherefore possible to determine the requiredspacing S of thereturn fold line from the outer side fold'line, to make the blank expandable and collapsible; ln other' words for'a box in which the outer and the inner side walls have a desired slope and height; theproper spac ing' 8' can'becdetermined' so that the blank can lie-pre glued, set-up. and re-collapsed:

V The. panel portions of the corner structuresare'aligned with the respectiveouter and inner. side wall panels; For example, the panel portion 79' and a portion ofthe flap.87 lie in thesarne. plane as the outer side wall'panel 20. The.v panel portions: 95, 105,. andia portion 0E1 the.

flap 109 lie in the same plane as the inner side wall panel 23. The panel portion 101 and the remainder of the flap 109 lie in the same plane as the outer side wall panel 21. The condition of the structure may also be characterized by the fact that the ridge fold lines 24 and 25 extend unbroken beyond the points 77 and 99, respectively.

Pressure is then exerted against the panel portions 87 and 199, causing the corner structures to assume a new and angular position as illustrated in Fig. 4. In the new position the panel portions 87 and 1199 move into the same plane, and similarly the panel portions 101 and 105 flatten out. The panel portions 73 and 95 extend at an angle with respect to the inner side walls 22 and 23. The portions of the flaps 87 and 109 move into the same plane which, however, lies at an angle with respect to the plane of the panel portions 79, 83 and 101, 195, the crease lines being 89 and 111.

As a next step, the side flaps 65 and 66 are folded over the securing flaps 87 and 109, as shown in Fig. 5. The blank structure is now in condition for the completion of the end walls. For this purpose the end wall structure is folded upwardly about the outer end fold line 14. Simultaneously, the edges 91 and 114 line up with the crease 51, and the edges 118 and 120 line up with the creases 89 and 111.

As the panel 47 is folded upon the end surfaces 79, 183 and 101, 105, the flaps 87 and 109 are folded back upon the panels from which they extend, clamping the side flaps 65 and 66 securely therebetween. Great rigidity is achieved by the engagements and abutments.

The assembly of the box end wall is completed by folding the lock flaps 57 and 58 back upon the bottom flap 53 and inserting the bottom flap with its lock flaps into the slit 35 underneath the panel portions 43 and 44. In inserted position the flaps 57 and 58 abut the edge of the cut 35 and prevent accidental withdrawal of the bottom flap 53 from the tucked-in position.

The assembly of the opposite end wall takes place in the same manner.

The completed box A is shown in Fig. 6. It possesses extraordinary strength and is greatly resistant to forces exerted on it from the inside, from the outside and from above.

A modified form of blank is shown in Fig. 8. This blank corresponds to the blank A of Fig. 1, except for the absence of the internal bottom or liner panel 32. In its place, a glue lap 32 is provided. Since the blank B corresponds to the blank A in all other respects, the same reference numerals are applied and it is unnecessary to describe the folding, gluing and setting up operations of the blank B in detail.

Fig. 9 is a vertical cross-section through the side walls of a box B" set up from the blank B. It is apparent that the bottom of the box is of single ply thickness. Return folds are formed by the panel 30 and the lap 32' on one side, and the panel 26 and the lap 28 on the other side. As in the previous embodiment, the provision of return folds permits the selection of any desired slope angle for the outer side Wall panel while yet retaining the feature of collapsibility of the pre-glued blank.

Fig. 10 illustrates a further modification C" of the box A. In this modification the liner panel 32" underlies the glue lap 28 with its marginal end portion.

Fig. 11 illustrates a box structure consisting of the box B" as shown in Fig. 9, to which a separate liner panel 125 is added. The liner panel 125 is wider than the interior space of the box measured between the inner side walls 23 and 22. Because of its width, the liner panel 125 extends into the return fold between the upper bottom panel 36 and the glue lap 32 on one side, and between the upper bottom panel 26 and the glue lap 28 on the other side.

Besides providing double ply thickness for the bottom, concealing the upper surface of the bottom panel 11 which is generally unfinished, the liner panel adds rigidity to the box because of the engagement of the edges of the liner panel 125 with the return fold lines 29 and 33. A box reinforced by a separate liner panel 125 has exceptionally great resistance to twisting.

Fig. 12 illustrates a modification of the structure of Fig. 11. In the box shown in Fig. 12 the separate liner panel 125' is smaller and its width is equal to the dis tance between the edges of the glue laps 32' and 28. The advantages of the liner 125 are the same as the advantages of the liner 125.

Additional means may be provided in the box struc ture for preventing the liner panel 125' from slipping into the return fold. As illustrated in Fig. 13, such means may assume the form of tabs 126 formed by U-shaped cuts 127 in the inner side walls. In the set up box the tabs 126 form extensions of the respective upper bottom panel 26 and 30, and the liner panel 125 rests on these tabs.

The cut 127 results in the formation of an aperture 127' in the respective inner side wall panel. ture may be concealed by the use of a liner panel 125 of appropriate thickness. For example, a liner panel of double face corrugated board may be used.

The blank C shown in Fig. 14 corresponds, in general, to the blank B shown in Fig. 8, except for certain modifications of the glue laps 128 and 132, and of the end wall structure.

The glue laps 128 and 132 have beveled lateral edges 129, and 133, 134, respectively. Preferably, the lateral edges extend at an angle of 45 with respect to the return fold lines 29 and 33, respectively.

In the finished box the edges 129 and 133 abut similar lateral edges 135 and 136 on an end flap 137 forming part of the end wall structure. The end flap 137 is articulated to an upper end bottom panel 138 along a return fold line 139. The upper end bottom panel 138 is articulated to the inner end wall panel 149 along a fold line 155.

Similarly, the end flap 140 at the opposite end wall structure is articulated to an upper end bottom panel 141 along a return fold line 142. The upper end bottom panel 141, in turn, is articulated to the inner end panel along fold line 156.

The blank C is pro-glued in a similar manner as the blank B of Fig. 8. The glue laps 12S and 132 are adhered to the main bottom panel 11 and the side wall structures are erected as hereinbefore described.

In the finished box C" the side wall structures are of similar construction as the side wall structures of the box A" shown in Fig. 6,- with the exception that the glue laps 128 and 132 overlie a portionof the main bottom panel 11 wlr'ch is exposed to view. Similarly, the end portions of the flaps 137 and 140 overlie a visible portion of the bottom panel;

The beveled edges 143, 130 abut in the assembled box and maintain the end flap 140 in its proper position. Similarly, the edges 129 and 135 abut and maintain the opposite end flap 137 in inserted position. The flaps 137 and 140 form return folds with the respective upper end bottom panels 138 and 141.

The protruding portions of the glue laps 128 and 132, and the protruding portions of the end flaps 137 and 140 produce a mitered frame effect, enhancing the appearance of the box. In addition, the engagement of the beveled edges of the glue laps 128, 132 and the end flaps 137 and 140 renders the box more rigid to twisting.

The assembly of the end structures of the box C" is extremely simple since it amounts to a mere tucking in of the return-folded-end flaps 137, 140 underneath the hollow end wall structures.

The stifiness of the board, that is the resistance of the stock to folding along the return fold lines 139 and 142 tends to urge the abutting beveled edges into secure engagement. In this connection it is of advantage to This aper- 17 cut-score the return fold lin s and 142, since the board is folded back upon itself at these fold lines. The cut :scores are indicated by dash-double-dot lines, and sufiiciently weaken the :stock to prevent formation .of a gap above the end flaps 137 and 140.

Obviously, the present invention is not restricted to the particular .form of box herein described, but may be incorporated in other forms of boxes with equal benefits. Thus, various additions, omissions, modifications, substitutions, ,and other changes may be made without departing from the spirit of the invention.

What is claimed'is:

l. A hollow walled folding box comprising, in combination, a main bottom panel; a pair of side wall structures .onopposite; sides of the main bottom panel, at least one end wall structure at on .en f he main b m panelrandcorner structure between eachside wall structure and said end wall structure; each of said side wall structures comprising, an outer side wall panel integral with, and articulated to, said main bottom panel along an outer side fold line; an inner side wall panel articulated to said outer'side wall panel along aside ridge fold line; an upper bottom panel articulated to said inner side wall panel along an inner side fold line; an intermediate bottom panel articulated tosaid upper bottom panel along a fold line spaced from, andparallel to, said inner side fold line and said outer side fold line, said intermediate bottom panel being folded back with respect tosaid upper bottom panel and forming with the upper bottom panel a return fold underneath the side ridge fold line, said intermediate bottom panel lying in direct contact with-said 'main bottompanel, said intermediate bottom panel'having asurface portion outside the insidefacing surfaces of the return fold at which surface portion the intermediate bottom panel is adhesively securedto one of the bottom panels of the box, thereby leaving the return fold proper unglued, said end wall structure comprising, an outer end wall panel articulated to, and integral with, saidmain bottom panel along an outer end fold line; an inner end wall panel articulated to said outer end vwall panel along an end ridge fold line; and a bottom flap articulated to said inner end panel along an inner end fold-lineg said corner structure comprising, an outer corner panel articulated to the outer side wall panel, 'an inner corner panel articulated to the innerside wall panel, both lines of articulation being directedto intersect at the side ridge fold line, and a connecting cornerpanel articulated .to the outer corner panel along .a lineal extension of the side ridge foldline and articulated tothe inner corner panel along a fold line which is also directed to the intersection of the said lines of articulation at, and with, the side ridge foldiline, said corner structure ,lying in the set up box, betweensaid outer end Wall panel and-said inner end wall panel.

2. A hollow walled folding box comprising, in cornbination, a main bottom panel; a pair of side wallstructures on opposite sides of the main bottompanel, at least one end wall structure at one end of the .main bottom panel; and a corner structure :between each side wall structure andrsaid end wall-structure; each of said side wall structures comprising, an outer side wallpanelintegral with, and articulated to, said main bottompanel along an outer=side,fold,line; an inner side .wall panel articulated to said. outerside wall panel along aside ridge fold line; an upper bottom panel articulated to said inner side wall panel along an inner side fold line; an intermediate bottom panel articulated to said upper bottom panel along a foldline spaced from, andparallel to, said inner .side fold line andsaid outer side fold line, said intermediate bottom panel being folded "back with respect to said upper bottom panel andforming with-the upper bottom panel a return fold underneath the side ridgefoldiline, the intermediate bottom panel of one side wall 'structureextending over, and indirect contactw-ith,

said main :bottom panel and adhesively secured to the intermediate bottom panel of the Opposite sidewall structure, whereby the blank of the box becomes a flat collapsible tubular blank in which the return folds proper are open and adapted to be flattened out; said end wall structure comprising, an outer end wall panel integral with, and articulated to, said main bottom panel along an outer end fold line; an inner end wall panel articulated to said outer end wall panel along an end ridge fold line; and a bottom flap articulated to said inner end panel along an inner end fold line; said corner structure comprising an outer corner panel articulated to the outer side wall panel, an inner corner panel articulated to the inner side wall panel, both lines of articulation being directed to intersect at theside ridgefold line, and a connecting corner panel articulated tolthe outer corner panel along a lineal extension of the side ridge fold line and articulated to the inner corner panel along a fold line which is also directed to the intersectionof-the said lines of articulation at, and with, the side ridge fold line, said corner structure lying, in the-set upboX, between said outer end wall panel and said inner end wall panel.

3. A hollow walled tolding'box comprising, in combination, a main bottom panel; a pair of side wall structures on opposite sides of the main bottom panel, at least one end wall structure at one end of the main bottom panel; and a corner structure between each side wall structure andsaid end wall structure; each of said side wall structures comprising, an outer :side wall panel integral with, and articulated to, said main bottom panel along an outer side fold line; ,an'inner side Wall panel articulated to said outer side wall panel along a side ridge fold line; an upper bottom panel articulated to'said inner side wall panel along an inner side fold line; an intermediate bottom panel articulated to said upperbottorn panel along a foldline spaced from, andparallel to, said inner side fold line and saidouter side fold line, said intermediate bottom panel being folded back with respect to said upper bottom panel and forming withthe upper bottom panel a return-fold underneath the .side ridge fold line, the intermediate bottom panel lying in immediate contact with, and being adhesively secured to, said main bottom panel at a surface areaofthe intermediate bottom panel lying on. the reverse sideiof the stock with respect to the insidefacing surfaces of the return fold, whereby the return folds properare. open andadapted to beflattened out for collapsing; said endwall structure comprising, an outer end wallpanel integraLwith, and articulated to, said main bottorn panel along an 'outerend fold line; an inner end wallpanel articulated tosaid outer end wall panel along an endridge fold line; and a bottom fiaparticulated to said inner ,end panel along an inner end foldline; said corner structure comprising, an outer cornerpanel articulatedtothe outerside wall panehan inner corner panel articulated to the inner side wall panel, both lines of articulation being directed to intersect at the side ridge foldline, and a connecting corner-panel articulated to the outer corner panelalonga lineal extension of the side ridge-fold line and articulated to the inner corner panel along afold line which is .also directed to the intersectionof the said;lines of articulation at, and .with, the side ridge fold line, said corner structure.lying, in theset up box, betweensaid outer end wall panel and said inner end wall panel.

4. A hollow-walledfoldingbox comprising, in combination, a main bottom panel; a pair of side wall structures on opposite sides of the main bottom .panel, at

least. one end wall structure atone end of the main bottorn panel; and acornenstructure between each sidewall structure andsaid e-nd wall structure; each of said side .wall structures comprising, an outer side wall panel integral-with, and articulated to, said main bottompanel along-anouter side'fold line; an inner side wall panel articulated to said outer side wall panel along a side ridge t d/l nden upperb t n ne a cul t d t sa inner sidewall panel along .an inner side fold line; an intermediate bottom panel articulated to said upper bottom panel along a fold line spaced from, and parallel to, said inner side fold line and said outer side fold line, said intermediate bottom panel being folded back upon with respect to said upper bottom panel and forming with the upper bottom panel a return fold underneath the side ridge fold line, the intermediate bottom panel lying in immediate contact with, and being adhesively secured to, said main bottom panel at a surface area lying on the opposite surface of the stock with respect to the insidetacing surfaces of the return fold, whereby the return folds proper are open and adapted to be flattened out for collapsing, the intermediate bottom panels of the opposite side wall structures covering said main bottom panel and forming a full liner-ply for said main bottom panel, said end wall structure comprising, an outer end Wall panel articulated to said main bottom panel along an outer end fold line; an inner end wall panel articulated to said outer end wall panel along an end ridge fold line; and a bottom flap articulated to said inner end panel along an inner end fold line; said corner structure comprising, an outer corner panel articulated to the outer side wall panel, an inner corner panel articulated to the inner side wall panel, both lines of articulation being directed to intersect at the side ridge fold line, and a connecting corner panel articulated to the outer corner panel along a lineal extension of the side ridge fold line and an articulated to the inner corner panel along a fold line which is also directed to the intersection of the said lines of articulation at, and with, the side ridge fold line, said corner structure lying, in the set up box, between said outer end wall panel and said inner end wall panel.

5. A hollow walled folding box comprising, in combination, a main bottom panel; a pair of side wall structures on opposite sides of the main bottom panel, at least one end wall structure at one end of the main bottom panel; and a comer structure between each side Wall structure and said end wall structure; each of said side wall structures comprising, an outer side wall panel articulated to said main bottom panel along an outer side fold line; an inner side wall panel articulated to said outer side Wall panel along a side ridge fold line; an upper bottom panel articulated to said inner side Wall panel along an inner side fold line; an intermediate bottom panel articulated to said upper bottom panel along a fold line spaced from, and parallel to, said inner side fold line and said outer side fold line, said intermediate bottom panel being folded back upon said upper bottom panel and forming with the upper bottom panel a return fold underneath the side ridge fold line, the intermediate bottom panel lying in immediate contact with, and being adhesively secured to, one of said bottom panels of the box in such a way as to leave the return fold proper unglued, the intermediate bottom panels of the opposite side Wall structures overlying said main bottom panel and at least one of said intermediate bottom panels forming a liner-ply for said main bottom panel, said end wall structure comprising, an outer end wall panel articulated to said main bottom panel along an outer end fold line; an inner end wall panel articulated to said outer end wall panel along an end ridge fold line; and a bottom flap articulated to said inner end panel along an inner end fold line; said liner ply having a slit therethrough substantially in line with the bottom edge of said inner end wall panel, said bottom flap extending through said slit 10 into the space between said main bottom panel and said liner ply; said corner structure comprising at least one corner panel articulated to one of the side Wall panels along fold line aimed at said side ridge fold line, said corner panel lying, in the set-up box, between said outer end wall panel and said inner end wall panel.

6. A hollow walled folding box comprising, in combina tion, a main bottom panel; a pair of side Wall structures on opposite sides of the main bottom panel, at least one end wall structure at one end of the main bottom panel; and a corner structure between each side wall structure and said end wall structure; each of said side wall struc tures comprising, an outer side wall panel integral with, and articulated to, said main bottom panel along an outer side fold line; an inner side wall panel articulated to said outer side wall panel along a side ridge fold line; an upper bottom panel articulated to said inner side wall panel along an inner side fold line; an intermediate bottom panel articulated to said upper bottom panel along a fold line spaced from, and parallel to, said inner side fold line and said outer side fold line, said intermediate bottom panel being folded back with respect to said upper bottom panel and forming with the upper bottom panel a return fold underneath the side ridge fold line, said intermediate bottom panel lying in immediate contact with, and being adhesively secured to, said main bottom panel at a surface area of the intermediate bottom panel lying on the reverse side of the stock with respect to the inside-facing surfaces of the return fold, whereby the return fold proper remains open and adapted to be flattened out for collapsing; said end wall structure comprising, an outer end Wall panel integral with, and articulated to, said main bottom panel along an outer end fold line; an inner end wall panel articulated to said outer end wall panel along an end ridge fold line; and a bottom flap articulated to said inner end panel along an inner end fold line; said corner structure comprising, an outer corner panel articulated to the outer side wall panel, an inner corner panel articulated to the inner side wall panel, both lines of articulation being directed to intersect at the side ridge fold line, and a connecting corner panel articulated to the outer corner panel along a lineal extension of the side ridge fold line and articulated to the inner corner panel along a fold line which is also directed to the intersection of the said lines of articulation at, and with, the side ridge fold line, said corner structure lying, in the set up box, between said outer end wall panel and said inner end wall panel; and a separate bottom liner panel having side edges, said liner panel extending with its side edges between the upper bottom panel and the intermediate bottom panel of each of said opposite side wall structures, said inner end Wall panel extending, in set-up condition, transverse with respect to the side edges of the liner panel.

References Cited in the file of this patent UNITED STATES PATENTS 1,758,512 Gross May 13, 1930 2,028,276 Evans Jan. 21, 1936 2,203,737 Moore June ll, 1940 2,494,234 Frankenstein Jan. 10, 1950 2,512,023 Johnson June 20, 1950 2,519,831 Frankenstein Aug. 22, 1950 2,641,858 Burr June 16, 1953 

